<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>set集合</title>d
    <script>
        let arr = [1, 2, 3, 4, 4, 5, 5, 6, 6, 6, 7, 8, 9];
        let set = new Set(arr);
        console.log(set);
    </script>
</head>
<body>

</body>
</html>